SU1740341A1 - Method for slime melt dry granulation - Google Patents

Abstract

The invention relates to the technology of processing liquid slag melts. The purpose of the invention is to intensify the granulation process and increase the grinding capacity of the slag. The method involves passing the slag melt through water-cooled rollers together with ground limestone with a dispersity of 500-5000 cm2 / g in an amount of 5-25% of the mass of the slag melt Electricity costs are reduced by 2-2.5 times. Grinding capacity was 17-20 kWh / t 2 table.

Description

The invention relates to the metallurgical and phosphorus industry, in particular, to the technology of processing liquid metallurgical and electrothermophosphorus slags.

A known method for processing molten slag is one in which the slag is cooled in two stages by feeding slag to the rollers and then to the layer heat exchanger-conveyor.

The disadvantage is the low cooling rate and, accordingly, the low performance of the rollers.

Closest to the present invention is a method in which the cooling is carried out in two stages on the surface of the rolls.

However, the method is characterized by an insufficient cooling rate, as well as a high density of the hardened slag tape, which causes low grinding ability.

The purpose of the invention is to intensify the dry granulation and increase the grinding capacity of the slag. Use of the method

allows to intensify the process of dry granulation, to improve the grinding ability of the obtained product 2.0-2.5 times

The goal is achieved by the fact that calcium carbonate is fed to the water-cooled rollers simultaneously with the slag melt, with a dispersion of from 500 to 5000 cm2 / g in an amount of 5-25% by weight of the slag melt

As a result of the interaction between the liquid melt and calcium carbonate, the liquid slag is rapidly solidifying. A further decrease in temperature occurs by a known method (cooling on the refrigerator or in natural conditions). The cooled slag is a loose, easily grindable mass with a large number of pores, micro- and macro-cracks.

The method is carried out as follows.

Fiery liquid slag with a temperature of 1450-1420 ° C from a smelting electric furnace, whose performance in an electrophoresis ishka is 10 t / h, is served by

SP

with

h

s about

with

Ј

chute on rollers. On the same rolls serves dispersed limestone in appropriate quantities (Table 1).

The slag at the exit of the rollers is a red-hot, but hardened ribbon-like mass, which is crushed on a gross crusher. The crushed slag is cooled on a layer cooler by blowing cold air. After cooling, the slag has a porous structure and is easily ground (Table 1).

The best slag grinding capacity is achieved in samples 2-6 (Table 1). The criterion for determining the dispersion of lime is the ablation of carbonate.

five

material and slag condition (Table 2, samples 2-6).

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A method for dry granulation of a slag melt by forming a slag ribbon on water-cooled rollers, crushing and subsequent cooling in a layer cooler by blowing with cold air, which in order to intensify the granulation process and improve the slag grinding capacity, simultaneously with the slag melt, rolls are fed to the rollers. calcium carbonate with dispersity of 500-5000 cm2 / g in the amount of 5-25% of the mass of the slag melt. Table 1 The results of experiments on dry granulation with different feed lime on the rollers table 2 The results of experiments on dry granulation with different dispersion limestone